Acrodyne NW8201E DIGITAL TELEVISION BROADCAST TRANSMITTER User Manual 32 NV8202 26 04 06 01 00

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Document ID	864554
Application ID	vnwefxrVtvE1edbLlVsrmQ==
Document Description	Users Manual Part 2
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	206.7kB (2583709 bits)
Date Submitted	2007-11-06 00:00:00
Date Available	2008-01-18 00:00:00
Creation Date	2007-11-02 12:57:13
Producing Software	Acrobat Distiller 5.0.5 (Windows)
Document Lastmod	2007-11-02 12:57:46
Document Title	32 NV8202-26.04.06-01.00.book
Document Creator	FrameMaker 7.0
Document Author:	HUPFAUER

Broadcasting Division
CHAPTER 2
DESIGN AND CHARACTERISTICS
Printed in Germany
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Chapter 2
Design and Characteristics
CONTENTS
1 DESIGN AND FUNCTION ................................................................. 1
1.1 Power Distribution ..........................................................................................4
1.1.1 Main Switch (Power Supply Terminal) .........................................................4
1.1.2 Motor Protection Switch ...............................................................................5
1.1.3 Automatic Line Fuse .....................................................................................6
1.1.4 Power Distribution Board ..............................................................................6
1.1.5 Auxiliary Power Supply .................................................................................7
1.1.6 Optional Socket ............................................................................................8
1.1.7 Grounding Bolt .............................................................................................8
1.2 Transmitter Control Unit ................................................................................9
1.2.1 NETCCU ......................................................................................................9
1.2.2 Rack Controller ...........................................................................................10
1.3 Connection Panel .........................................................................................11
1.4 Exciter Unit ....................................................................................................12
1.4.1 Exciter ........................................................................................................13
1.4.2 Exciter Switch .............................................................................................13
1.5 Output Stage Unit .........................................................................................14
1.5.1 Splitter ........................................................................................................16
1.5.2 Amplifier .....................................................................................................17
1.5.3 Combiner ....................................................................................................18
1.5.4 Absorber .....................................................................................................19
1.6 Test Lightning Protection System ..............................................................20
1.6.1 Lightning Protection ....................................................................................20
1.6.2 Directional Coupler .....................................................................................21
1.6.3 Test Interface .............................................................................................22
1.7 Harmonics Filter ...........................................................................................22
1.8 RF Connector ................................................................................................23
1.9 Cooling system .............................................................................................24
1.9.1 Air Intake/Exhaust Duct ..............................................................................25
1.9.2 Fans ...........................................................................................................26
1.9.3 Starting Capacitor .......................................................................................27
1.9.4 Differential Pressure Gage .........................................................................28
1.9.5 Temperature Sensors .................................................................................29
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Chapter 2
Design and Characteristics
1.10 Transformer ..................................................................................................30
2 SPECIFICATIONS ........................................................................... 31
2.1 Transmitter System in General ...................................................................31
2.2 Transmitter System - Specifically NW8202 .................................................31
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Chapter 2
Design and Characteristics
Design and Function
The new, air-cooled Transmitter Family NW820x is designed for transmitting digital TV signals in the IV and V frequency bands (UHF). The digital standards DVB-T, ATSC, DMB-T
and MediaFLO can be transmitted.
LDMOS transistor-based amplifiers ensure high output power while requiring only minimum
space. For digital TV, output power of 325 W to 1.95 kW is available.
Both the power class of the transmitter and its type designation depend on the number of
built-in amplifiers.
Name
Number of amplifiers
Power
NW8201
325 W
NW8202
650 W
NW8203
975 W
NW8204
1.3 kW
NW8205
1.625 kW
NW8206
1.95 kW
This chapter describes the transmitter's design and the functions of its components.
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TS1
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Ext 1PPS
TS4
TS3
TS2
TS1
Ext 1PPS
TS4
TS3
TS2
Control
1pps
120MHz
Control
1pps
120MHz
PLL
Coder
Mainboard
TV Exciter SX800 B
Input
Interface
DTV
3 x TS
PLL
Coder
Mainboard
TV Exciter SX800 A
Input
Interface
DTV
3 x TS
Linear
and
nonlinear
Precorrection
Linear
and
nonlinear
Precorrection
Dig. IF
120MHz
Dig. IQ
Dig. IF
120MHz
Dig. IQ
Downconverter
Synthesizer
Upconverter
Downconverter
Synthesizer
Upconverter
RF N
Ext. REF
10MHz Mon.
LO Mon.
RF Mon.
RF DTV
RF N
Ext. REF
10MHz Mon.
LO Mon.
RF Mon.
RF DTV
Option
Exciter Standby
max. 6 VM8350A1
Harmonics
Filter
Amplifier
VM8350A1
Lightning
Protection
Measurement
Coupler
RF
Output
Chapter 2
Design and Characteristics
Fig. 1 Block diagram of DTV transmitters: In this example NW8204E/V
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Chapter 2
Design and Characteristics
Fig. 2 Transmitter NW8202 modules
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Chapter 2
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
Design and Characteristics
Connection panel
Exciter
Transmitter control unit
Output stage
Power distribution
RF connector
Test lightning protection system
Splitter/combiner unit
Harmonics filter
Intake box (fan)
The NW8202 consists of the following units and modules:
 Power distribution
– Main switch
– Motor protection switch
– Automatic line fuse
– Power distribution board
– Auxiliary power supply
– Optional socket
– Grounding bolt
 Transmitter control unit components
– NETCCU®
– Rack controller
 Connection panel
 Exciter unit
– Exciters (1 or 2)
– Exciter switch (in case of standby exciter)
 Output stage unit
– Splitter
– Amplifiers (1 to 6)
– Combiner
– Absorber
 Harmonics filter
 Test lightning protection system
– Lightning protection
– Directional coupler
– Test interface
 RF Connector
 Cooling system
– Air intake and exhaust duct
– Fans (2)
– Starting capacitor (2)
– Differential pressure gages (2)
– Temperature sensors (2)
 Transformer (optional)
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Chapter 2
1.1
Design and Characteristics
Power Distribution
Fig. 3 Power distribution
1)
2)
3)
4)
5)
6)
7)
Main switch (power supply terminal)
Motor protection switch
Automatic line fuse
Power distribution board
Auxiliary power supply
Optional socket
Grounding bolt
The power distribution is designed for max. 32 A and contains the following components:
 Main switch (power supply terminal)
 Motor protection switch
 Automatic line fuse
 Power distribution board
 Auxiliary power supply
 Optional socket
 Grounding Bolt
1.1.1
Main Switch (Power Supply Terminal)
Fig. 4 Main switch
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Chapter 2
Design and Characteristics
The main switch fully disconnects the transmitter rack from the AC power supply. It is connected to three-phase alternating current and a neutral conductor.
Note
The main switch can be equipped with a padlock to prevent unauthorized persons from
switching it off and on.
Fig. 5 Main switch with fuse
1.1.2
Motor Protection Switch
Fig. 6 Motor protection switches
The motor protection switches are used to switch amplifiers on and off, as well as to protect
the subsequent supply cables and amplifiers from overloading. As shipped from the factory,
the number of motor protection switches matches the number of built-in amplifiers. The
arrangement of amplifiers and motor protection switches is shown on the front panel.
The thermally activated overcurrent release of the motor protection switches is factory-set.
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Chapter 2
1.1.3
Design and Characteristics
Automatic Line Fuse
Fig. 7 Automatic line fuses
The automatic line fuses are used to protect the power lines, e.g. in the event of a shortcircuit and when the following equipment is switched on and off:
 NetCCU® (F1)
 EXCITER A/B (F2/F3)
 Optional add-on equipment (F4)
 Auxiliary power supply (F5)
 Fan (F6/F7)
 Controller (F8)
– External cooling system
– Controller for dummy antennas
– Optional external fan
The arrangement of the equipment and the automatic line fuses is shown on the cover.
1.1.4
Power Distribution Board
Fig. 8 Power distribution board
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Chapter 2
Design and Characteristics
The power distribution board is directly connected to the overcurrent protector switches and
contains permanently-wired transmitter-internal cables and transmitter-external components (customer-interfaces) to which external equipment can be connected.
Note
The appropriate unequipped connectors are part of the transmitter and are located at the
assigned positions.
The following equipment is or can be connected to the power distribution board:
 NETCCU®
 EXCITER A/B
 Fan
 External fan (switched phase for controlling an external contactor)
 External dummy antenna (switched phase for controlling an external contactor)
 RF carrier loop
 External RF absorber fault (system absorber)
 Overcurrent (external cooling)
 Connector for rack controller
1.1.5
Auxiliary Power Supply
Fig. 9 Auxiliary power supply
The primary task of the auxiliary power supply (+12 V) is to provide power to the additional
control components in the rack. The required redundancy of this auxiliary voltage is generated via the exciters, which also output a +12 V current.
The following modules are powered by the auxiliary power supply:
 Rack controller
 CANBUS interface of the amplifiers
 Switching relay in the power distribution
 RF rectifier/test directional coupler when the standby transmitter is active
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Modify Date                     : 2007:11:02 12:57:46-04:00
Create Date                     : 2007:11:02 12:57:13-04:00
Title                           : 32 NV8202-26.04.06-01.00.book
Author                          : HUPFAUER
Creator                         : FrameMaker 7.0
Producer                        : Acrobat Distiller 5.0.5 (Windows)
Page Count                      : 12
Mod Date                        : 2007:11:02 12:57:46-04:00
Creation Date                   : 2007:11:02 12:57:13-04:00
Metadata Date                   : 2007:11:02 12:57:46-04:00
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